Add upload backend

endpoints/upload.php

@@ -0,0 +1,14 @@
+<?php
+
+require_once "lib/upload.php";
+
+function endpoint($endpoint_data): array
+{
+
+    return match ($endpoint_data["action"]) {
+        "getMyFiles" => listFiles(),
+        "getAllFiles" => listFiles(false),
+        "UploadFiles" => parseIncomingFiles(),
+        default => ["Status" => "Fail", "message" => "Invalid action"],
+    };
+}